apps/smime.c

   1 /* smime.c */
   2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
   3  * project 1999.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 /* S/MIME utility function */
  60
  61 #include <stdio.h>
  62 #include <string.h>
  63 #include "apps.h"
  64 #include <openssl/pem.h>
  65 #include <openssl/err.h>
  66
  67 #undef PROG
  68 #define PROG smime_main
  69 static X509 *load_cert(char *file);
  70 static EVP_PKEY *load_key(char *file, char *pass);
  71 static STACK_OF(X509) *load_certs(char *file);
  72 static X509_STORE *setup_verify(char *CAfile, char *CApath);
  73 static int save_certs(char *signerfile, STACK_OF(X509) *signers);
  74
  75 #define SMIME_OP        0x10
  76 #define SMIME_ENCRYPT   (1 | SMIME_OP)
  77 #define SMIME_DECRYPT   2
  78 #define SMIME_SIGN      (3 | SMIME_OP)
  79 #define SMIME_VERIFY    4
  80 #define SMIME_PK7OUT    5
  81
  82 int MAIN(int argc, char **argv)
  83 {
  84         int operation = 0;
  85         int ret = 0;
  86         char **args;
  87         char *inmode = "r", *outmode = "w";
  88         char *infile = NULL, *outfile = NULL;
  89         char *signerfile = NULL, *recipfile = NULL;
  90         char *certfile = NULL, *keyfile = NULL;
  91         EVP_CIPHER *cipher = NULL;
  92         PKCS7 *p7 = NULL;
  93         X509_STORE *store = NULL;
  94         X509 *cert = NULL, *recip = NULL, *signer = NULL;
  95         EVP_PKEY *key = NULL;
  96         STACK_OF(X509) *encerts = NULL, *other = NULL;
  97         BIO *in = NULL, *out = NULL, *indata = NULL;
  98         int badarg = 0;
  99         int flags = PKCS7_DETACHED;
 100         char *to = NULL, *from = NULL, *subject = NULL;
 101         char *CAfile = NULL, *CApath = NULL, *passin = NULL;
 102
 103         args = argv + 1;
 104
 105         ret = 1;
 106
 107         while (!badarg && *args && *args[0] == '-') {
 108                 if (!strcmp (*args, "-encrypt")) operation = SMIME_ENCRYPT;
 109                 else if (!strcmp (*args, "-decrypt")) operation = SMIME_DECRYPT;
 110                 else if (!strcmp (*args, "-sign")) operation = SMIME_SIGN;
 111                 else if (!strcmp (*args, "-verify")) operation = SMIME_VERIFY;
 112                 else if (!strcmp (*args, "-pk7out")) operation = SMIME_PK7OUT;
 113                 else if (!strcmp (*args, "-des3"))
 114                                 cipher = EVP_des_ede3_cbc();
 115                 else if (!strcmp (*args, "-des"))
 116                                 cipher = EVP_des_cbc();
 117                 else if (!strcmp (*args, "-rc2-40"))
 118                                 cipher = EVP_rc2_40_cbc();
 119                 else if (!strcmp (*args, "-rc2-128"))
 120                                 cipher = EVP_rc2_cbc();
 121                 else if (!strcmp (*args, "-rc2-64"))
 122                                 cipher = EVP_rc2_64_cbc();
 123                 else if (!strcmp (*args, "-text"))
 124                                 flags |= PKCS7_TEXT;
 125                 else if (!strcmp (*args, "-nointern"))
 126                                 flags |= PKCS7_NOINTERN;
 127                 else if (!strcmp (*args, "-noverify"))
 128                                 flags |= PKCS7_NOVERIFY;
 129                 else if (!strcmp (*args, "-nochain"))
 130                                 flags |= PKCS7_NOCHAIN;
 131                 else if (!strcmp (*args, "-nocerts"))
 132                                 flags |= PKCS7_NOCERTS;
 133                 else if (!strcmp (*args, "-noattr"))
 134                                 flags |= PKCS7_NOATTR;
 135                 else if (!strcmp (*args, "-nodetach"))
 136                                 flags &= ~PKCS7_DETACHED;
 137                 else if (!strcmp (*args, "-binary"))
 138                                 flags |= PKCS7_BINARY;
 139                 else if (!strcmp (*args, "-nosigs"))
 140                                 flags |= PKCS7_NOSIGS;
 141                 else if (!strcmp(*argv,"-passin")) {
 142                         if (--argc < 1) badarg = 1;
 143                         else passin= *(++argv);
 144                 } else if (!strcmp(*argv,"-envpassin")) {
 145                         if (--argc < 1) badarg = 1;
 146                         else if(!(passin= getenv(*(++argv)))) {
 147                                 BIO_printf(bio_err,
 148                                  "Can't read environment variable %s\n",
 149                                                                 *argv);
 150                                 badarg = 1;
 151                         }
 152                 } else if (!strcmp (*args, "-to")) {
 153                         if (args[1]) {
 154                                 args++;
 155                                 to = *args;
 156                         } else badarg = 1;
 157                 } else if (!strcmp (*args, "-from")) {
 158                         if (args[1]) {
 159                                 args++;
 160                                 from = *args;
 161                         } else badarg = 1;
 162                 } else if (!strcmp (*args, "-subject")) {
 163                         if (args[1]) {
 164                                 args++;
 165                                 subject = *args;
 166                         } else badarg = 1;
 167                 } else if (!strcmp (*args, "-signer")) {
 168                         if (args[1]) {
 169                                 args++;
 170                                 signerfile = *args;
 171                         } else badarg = 1;
 172                 } else if (!strcmp (*args, "-recip")) {
 173                         if (args[1]) {
 174                                 args++;
 175                                 recipfile = *args;
 176                         } else badarg = 1;
 177                 } else if (!strcmp (*args, "-inkey")) {
 178                         if (args[1]) {
 179                                 args++;
 180                                 keyfile = *args;
 181                         } else badarg = 1;
 182                 } else if (!strcmp (*args, "-certfile")) {
 183                         if (args[1]) {
 184                                 args++;
 185                                 certfile = *args;
 186                         } else badarg = 1;
 187                 } else if (!strcmp (*args, "-CAfile")) {
 188                         if (args[1]) {
 189                                 args++;
 190                                 CAfile = *args;
 191                         } else badarg = 1;
 192                 } else if (!strcmp (*args, "-CApath")) {
 193                         if (args[1]) {
 194                                 args++;
 195                                 CApath = *args;
 196                         } else badarg = 1;
 197                 } else if (!strcmp (*args, "-in")) {
 198                         if (args[1]) {
 199                                 args++;
 200                                 infile = *args;
 201                         } else badarg = 1;
 202                 } else if (!strcmp (*args, "-out")) {
 203                         if (args[1]) {
 204                                 args++;
 205                                 outfile = *args;
 206                         } else badarg = 1;
 207                 } else badarg = 1;
 208                 args++;
 209         }
 210
 211         if(operation == SMIME_SIGN) {
 212                 if(!signerfile) {
 213                         BIO_printf(bio_err, "No signer certificate specified\n");
 214                         badarg = 1;
 215                 }
 216         } else if(operation == SMIME_DECRYPT) {
 217                 if(!recipfile) {
 218                         BIO_printf(bio_err, "No recipient certificate and key specified\n");
 219                         badarg = 1;
 220                 }
 221         } else if(operation == SMIME_ENCRYPT) {
 222                 if(!*args) {
 223                         BIO_printf(bio_err, "No recipient(s) certificate(s) specified\n");
 224                         badarg = 1;
 225                 }
 226         } else if(!operation) badarg = 1;
 227
 228         if (badarg) {
 229                 BIO_printf (bio_err, "Usage smime [options] cert.pem ...\n");
 230                 BIO_printf (bio_err, "where options are\n");
 231                 BIO_printf (bio_err, "-encrypt       encrypt message\n");
 232                 BIO_printf (bio_err, "-decrypt       decrypt encrypted message\n");
 233                 BIO_printf (bio_err, "-sign          sign message\n");
 234                 BIO_printf (bio_err, "-verify        verify signed message\n");
 235                 BIO_printf (bio_err, "-pk7out        output PKCS#7 structure\n");
 236                 BIO_printf (bio_err, "-des3          encrypt with triple DES\n");
 237                 BIO_printf (bio_err, "-rc2-40        encrypt with RC2-40\n");
 238                 BIO_printf (bio_err, "-rc2-64        encrypt with RC2-64\n");
 239                 BIO_printf (bio_err, "-rc2-128       encrypt with RC2-128\n");
 240                 BIO_printf (bio_err, "-nointern      don't search certificates in message for signer\n");
 241                 BIO_printf (bio_err, "-nosigs        don't verify message signature\n");
 242                 BIO_printf (bio_err, "-noverify      don't verify signers certificate\n");
 243                 BIO_printf (bio_err, "-nocerts       don't include signers certificate when signing\n");
 244                 BIO_printf (bio_err, "-nodetach      use opaque signing\n");
 245                 BIO_printf (bio_err, "-noattr        don't include any signed attributes\n");
 246                 BIO_printf (bio_err, "-binary        don't translate message to text\n");
 247                 BIO_printf (bio_err, "-in file       input file\n");
 248                 BIO_printf (bio_err, "-certfile file other certificates file\n");
 249                 BIO_printf (bio_err, "-signer file   signer certificate file\n");
 250                 BIO_printf (bio_err, "-recip  file   recipient certificate file\n");
 251                 BIO_printf (bio_err, "-in file       input file\n");
 252                 BIO_printf (bio_err, "-inkey file    input private key (if not signer or recipient)\n");
 253                 BIO_printf (bio_err, "-out file      output file\n");
 254                 BIO_printf (bio_err, "-to addr       to address\n");
 255                 BIO_printf (bio_err, "-from ad       from address\n");
 256                 BIO_printf (bio_err, "-subject s     subject\n");
 257                 BIO_printf (bio_err, "-text          include or delete text MIME headers\n");
 258                 BIO_printf (bio_err, "-CApath dir    trusted certificates directory\n");
 259                 BIO_printf (bio_err, "-CAfile file   trusted certificates file\n");
 260                 BIO_printf (bio_err, "cert.pem       recipient certificate(s)\n");
 261                 goto end;
 262         }
 263
 264         ret = 2;
 265
 266         if(operation != SMIME_SIGN) flags &= ~PKCS7_DETACHED;
 267
 268         if(flags & PKCS7_BINARY) {
 269                 if(operation & SMIME_OP) inmode = "rb";
 270                 else outmode = "rb";
 271         }
 272
 273         if(operation == SMIME_ENCRYPT) {
 274                 if (!cipher) cipher = EVP_rc2_40_cbc();
 275                 encerts = sk_X509_new_null();
 276                 while (*args) {
 277                         if(!(cert = load_cert(*args))) {
 278                                 BIO_printf(bio_err, "Can't read recipent certificate file %s\n", *args);
 279                                 goto end;
 280                         }
 281                         sk_X509_push(encerts, cert);
 282                         cert = NULL;
 283                         args++;
 284                 }
 285         }
 286
 287         if(signerfile && (operation == SMIME_SIGN)) {
 288                 if(!(signer = load_cert(signerfile))) {
 289                         BIO_printf(bio_err, "Can't read signer certificate file %s\n", signerfile);
 290                         goto end;
 291                 }
 292         }
 293
 294         if(certfile) {
 295                 if(!(other = load_certs(certfile))) {
 296                         BIO_printf(bio_err, "Can't read certificate file %s\n", certfile);
 297                         ERR_print_errors(bio_err);
 298                         goto end;
 299                 }
 300         }
 301
 302         if(recipfile && (operation == SMIME_DECRYPT)) {
 303                 if(!(recip = load_cert(recipfile))) {
 304                         BIO_printf(bio_err, "Can't read recipient certificate file %s\n", recipfile);
 305                         ERR_print_errors(bio_err);
 306                         goto end;
 307                 }
 308         }
 309
 310         if(operation == SMIME_DECRYPT) {
 311                 if(!keyfile) keyfile = recipfile;
 312         } else if(operation == SMIME_SIGN) {
 313                 if(!keyfile) keyfile = signerfile;
 314         } else keyfile = NULL;
 315
 316         if(keyfile) {
 317                 if(!(key = load_key(keyfile, passin))) {
 318                         BIO_printf(bio_err, "Can't read recipient certificate file %s\n", keyfile);
 319                         ERR_print_errors(bio_err);
 320                         goto end;
 321                 }
 322         }
 323
 324         if (infile) {
 325                 if (!(in = BIO_new_file(infile, inmode))) {
 326                         BIO_printf (bio_err,
 327                                  "Can't open input file %s\n", infile);
 328                         goto end;
 329                 }
 330         } else in = BIO_new_fp(stdin, BIO_NOCLOSE);
 331
 332         if (outfile) {
 333                 if (!(out = BIO_new_file(outfile, outmode))) {
 334                         BIO_printf (bio_err,
 335                                  "Can't open output file %s\n", outfile);
 336                         goto end;
 337                 }
 338         } else out = BIO_new_fp(stdout, BIO_NOCLOSE);
 339
 340         if(operation == SMIME_VERIFY)
 341                 if(!(store = setup_verify(CAfile, CApath))) goto end;
 342
 343         ret = 3;
 344
 345         if(operation == SMIME_ENCRYPT) {
 346                 p7 = PKCS7_encrypt(encerts, in, cipher, flags);
 347         } else if(operation == SMIME_SIGN) {
 348                 p7 = PKCS7_sign(signer, key, other, in, flags);
 349                 BIO_reset(in);
 350         } else {
 351                 if(!(p7 = SMIME_read_PKCS7(in, &indata))) {
 352                         BIO_printf(bio_err, "Error reading S/MIME message\n");
 353                         goto end;
 354                 }
 355         }
 356
 357         if(!p7) {
 358                 BIO_printf(bio_err, "Error creating PKCS#7 structure\n");
 359                 goto end;
 360         }
 361
 362         ret = 4;
 363         if(operation == SMIME_DECRYPT) {
 364                 if(!PKCS7_decrypt(p7, key, recip, out, flags)) {
 365                         BIO_printf(bio_err, "Error decrypting PKCS#7 structure\n");
 366                         goto end;
 367                 }
 368         } else if(operation == SMIME_VERIFY) {
 369                 STACK_OF(X509) *signers;
 370                 if(PKCS7_verify(p7, other, store, indata, out, flags)) {
 371                         BIO_printf(bio_err, "Verification Successful\n");
 372                 } else {
 373                         BIO_printf(bio_err, "Verification Failure\n");
 374                         goto end;
 375                 }
 376                 signers = PKCS7_iget_signers(p7, other, flags);
 377                 if(!save_certs(signerfile, signers)) {
 378                         BIO_printf(bio_err, "Error writing signers to %s\n",
 379                                                                 signerfile);
 380                         ret = 5;
 381                         goto end;
 382                 }
 383                 sk_X509_free(signers);
 384         } else if(operation == SMIME_PK7OUT) {
 385                 PEM_write_bio_PKCS7(out, p7);
 386         } else {
 387                 if(to) BIO_printf(out, "To: %s\n", to);
 388                 if(from) BIO_printf(out, "From: %s\n", from);
 389                 if(subject) BIO_printf(out, "Subject: %s\n", subject);
 390                 SMIME_write_PKCS7(out, p7, in, flags);
 391         }
 392         ret = 0;
 393 end:
 394         if(ret) ERR_print_errors(bio_err);
 395         sk_X509_pop_free(encerts, X509_free);
 396         sk_X509_pop_free(other, X509_free);
 397         X509_STORE_free(store);
 398         X509_free(cert);
 399         X509_free(recip);
 400         X509_free(signer);
 401         EVP_PKEY_free(key);
 402         PKCS7_free(p7);
 403         BIO_free(in);
 404         BIO_free(indata);
 405         BIO_free(out);
 406         return (ret);
 407 }
 408
 409 static X509 *load_cert(char *file)
 410 {
 411         BIO *in;
 412         X509 *cert;
 413         if(!(in = BIO_new_file(file, "r"))) return NULL;
 414         cert = PEM_read_bio_X509(in, NULL, NULL,NULL);
 415         BIO_free(in);
 416         return cert;
 417 }
 418
 419 static EVP_PKEY *load_key(char *file, char *pass)
 420 {
 421         BIO *in;
 422         EVP_PKEY *key;
 423         if(!(in = BIO_new_file(file, "r"))) return NULL;
 424         key = PEM_read_bio_PrivateKey(in, NULL,PEM_cb,pass);
 425         BIO_free(in);
 426         return key;
 427 }
 428
 429 static STACK_OF(X509) *load_certs(char *file)
 430 {
 431         BIO *in;
 432         int i;
 433         STACK_OF(X509) *othercerts;
 434         STACK_OF(X509_INFO) *allcerts;
 435         X509_INFO *xi;
 436         if(!(in = BIO_new_file(file, "r"))) return NULL;
 437         othercerts = sk_X509_new(NULL);
 438         if(!othercerts) return NULL;
 439         allcerts = PEM_X509_INFO_read_bio(in, NULL, NULL, NULL);
 440         for(i = 0; i < sk_X509_INFO_num(allcerts); i++) {
 441                 xi = sk_X509_INFO_value (allcerts, i);
 442                 if (xi->x509) {
 443                         sk_X509_push(othercerts, xi->x509);
 444                         xi->x509 = NULL;
 445                 }
 446         }
 447         sk_X509_INFO_pop_free(allcerts, X509_INFO_free);
 448         BIO_free(in);
 449         return othercerts;
 450 }
 451
 452 static X509_STORE *setup_verify(char *CAfile, char *CApath)
 453 {
 454         X509_STORE *store;
 455         X509_LOOKUP *lookup;
 456         if(!(store = X509_STORE_new())) goto end;
 457         lookup=X509_STORE_add_lookup(store,X509_LOOKUP_file());
 458         if (lookup == NULL) goto end;
 459         if (CAfile) {
 460                 if(!X509_LOOKUP_load_file(lookup,CAfile,X509_FILETYPE_PEM)) {
 461                         BIO_printf(bio_err, "Error loading file %s\n", CAfile);
 462                         goto end;
 463                 }
 464         } else X509_LOOKUP_load_file(lookup,NULL,X509_FILETYPE_DEFAULT);
 465
 466         lookup=X509_STORE_add_lookup(store,X509_LOOKUP_hash_dir());
 467         if (lookup == NULL) goto end;
 468         if (CApath) {
 469                 if(!X509_LOOKUP_add_dir(lookup,CApath,X509_FILETYPE_PEM)) {
 470                         BIO_printf(bio_err, "Error loading directory %s\n", CApath);
 471                         goto end;
 472                 }
 473         } else X509_LOOKUP_add_dir(lookup,NULL,X509_FILETYPE_DEFAULT);
 474
 475         ERR_clear_error();
 476         return store;
 477         end:
 478         X509_STORE_free(store);
 479         return NULL;
 480 }
 481
 482 int save_certs(char *signerfile, STACK_OF(X509) *signers)
 483 {
 484         int i;
 485         BIO *tmp;
 486         if(!signerfile) return 1;
 487         tmp = BIO_new_file(signerfile, "w");
 488         if(!tmp) return 0;
 489         for(i = 0; i < sk_X509_num(signers); i++)
 490                 PEM_write_bio_X509(tmp, sk_X509_value(signers, i));
 491         BIO_free(tmp);
 492         return 1;
 493 }
 494